Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3616bccc76fdd42…

MALICIOUS

PDF

90.6 KB Created: 2021-07-16 02:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ab5f6047df367804f0e8e14cebd36a2a SHA-1: 0ac2d08550f45875300eab1e1c8cf5e905854cb6 SHA-256: c3616bccc76fdd4289728b3f1e663e73d113045dff0410f9abcd160cf07af499
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of links, many of which point to compromised WordPress sites utilizing formcraft plugins for file uploads. This suggests a phishing or malware distribution attempt, where the PDF serves as a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e1d391bfd---764379025.pdf In PDF document text
    • http://studioambienteterritorio.it/userfiles/files/41482058848.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b24fa4384747eb4b7da8b35a26361297/bosisanak.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f19756ac40---wafakavodabokibupire.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/10744848059.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/fezopatipu.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2848be8dd---41978913924.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/17a6ba4d2f6311cce815bd4e9422f352/pewijetedatiwajekatulun.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609efbfcb8487---rupotuvagasivizufaforazom.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c695a9d2a73---jolojolota.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/pokidipibatenuvumeke.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160988530c4110---8767179207.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/98588857516.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/79aea2c365b83d805e6fbcc87671afe3/93334208807.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c877532fb4---33189461133.pdfIn PDF document text
    • https://campermagazine.tv/public/file/tidizavosivixojeze.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/be5ed030455db65feca093ee486b8039/supemarunulojumilebib.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/586410e10ccb447bbc35aa453fc2e96d/faruniwukurakefuwuv.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be08e918f---31711270932.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160794b5b202fe---madudugotagufuduj.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f1bb5f597c5dd430d92437c7233e49a4/78863394730.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609660232fb2a---seveberewuled.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160883fe56982c---gaxevodunizajozodepaz.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e2a0539181f6cd0fee95e3aa3a9f6ee6/donoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=transient+ischemic+attack+differential+diagnosisPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 16656 bytes
SHA-256: 0ddef0519c5f0a086e0fc65e73e6372177a5d422382a24f75a5ef70c6a51ea6c
font_02_sfnt_off00012b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B20 10976 bytes
SHA-256: 24961c4859ccc23cd0d605060b7689c4fa39e0cd9a3d59e76b76362c99d4544c
font_03_sfnt_off00014436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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